php-doc-en/reference/openssl/functions/openssl-private-encrypt.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.openssl-private-encrypt">
 <refnamediv>
  <refname>openssl_private_encrypt</refname>
  <refpurpose>Encrypts data with private key </refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>openssl_private_encrypt</methodname>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
   <methodparam><type>string</type><parameter role="reference">crypted</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>key</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>padding</parameter><initializer>OPENSSL_PKCS1_PADDING</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>openssl_private_encrypt</function> encrypts <parameter>data</parameter>
   with private <parameter>key</parameter> and stores the result into
   <parameter>crypted</parameter>. Encrypted data can be decrypted via
   <function>openssl_public_decrypt</function>. 
  </para>
  <para>
   This function can be used e.g. to sign data (or its hash) to prove that it
   is not written by someone else.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>crypted</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>key</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>padding</parameter></term>
     <listitem>
      <para>
       <parameter>padding</parameter> can be one of
       <constant>OPENSSL_PKCS1_PADDING</constant>,
       <constant>OPENSSL_NO_PADDING</constant>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>openssl_public_encrypt</function></member>
    <member><function>openssl_public_decrypt</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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